WIRELESS POWER RECEIVER WITH MULTIPLE RECEIVER COILS

• US 20130043734A1
• Filed: 04/18/2012
• Published: 02/21/2013
• Est. Priority Date: 08/16/2011
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Kallal, Edward Kenneth, Stone, Martin, Carobolante, Francesco
• Granted Patent: US 10,523,276 B2
• Time in Patent Office: Days
• US Class Current: 307/104
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/20 using microwaves or radio frequency waves
• CPC Class Codes: H02J 50/40 using two or more transmitting or receiving devices H02J50/50 takes precedence
• CPC Class Codes: H02J 50/60 responsive to the presence of foreign objects, e.g. detection of living beings
• CPC Class Codes: H02J 7/00 Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
• CPC Class Codes: H02J 7/00034 Charger exchanging data with an electronic device, i.e. telephone, whose internal battery is under charge
• CPC Class Codes: H04B 5/263 Multiple coils at either side
• CPC Class Codes: H04B 5/79 for data transfer in combination with power transfer
• CPC Class Codes: H04B 7/08 at the receiving station

Abstract

Systems, methods and apparatus are disclosed for wireless power transfer using multiple receive coils. In one aspect a wireless power receiver is provided that is configured to receive wireless power from a wireless power transmit coil. The wireless power receiver includes a first receive coil having a first mutual coupling with the transmit coil. The wireless power receiver further includes a second receive coil having a second mutual coupling with the transmit coil. The wireless power receiver further includes a load coupled to at least one of the first receive coil and the second receive coil for receiving the wireless power.

Claims

1. A wireless power receiver configured to receive wireless power from a wireless power transmit coil, the wireless power receiver comprising:

a first receive coil having a first mutual coupling with the transmit coil;

a second receive coil having a second mutual coupling with the transmit coil, the second receive coil designed for substantially the same frequency of operation as the first receive coil; and

a load coupled to at least one of the first receive coil and the second receive coil, the load configured to receive wireless power,

wherein an orientation of the first receive coil is variable with respect to an orientation of the second receive coil.

2. The wireless power receiver of claim 1, further comprising:

a first rectifier coupled to the first receive coil;

a second rectifier coupled to the second receive coil; and

a regulator configured to couple the first rectifier and the second rectifier to the load.

3. The wireless power receiver of claim 1, further comprising:

a rectifier coupled to the first receive coil and the second receive coil; and

a regulator configured to couple the rectifier to the load.

4. The wireless power receiver of claim 3, wherein the regulator is configured to receive, via the rectifier, power from one of the first receive coil and the second receive coil, based on a characteristic of the first receive coil and the second receive coil.

5. The wireless power receiver of claim 4, wherein the characteristic comprises a voltage at the first receive coil and the second receive coil.

6. The wireless power receiver of claim 4, wherein the characteristic comprises a mutual inductance between the first receive coil and the transmit coil, and between the second receive coil and the transmit coil.

7. The wireless power receiver of claim 1, wherein the wireless power receiver is further configured to receive wireless power from a second wireless power transmit coil, the first receive coil having a third mutual coupling with the second transmit coil, the second receive coil having a fourth mutual coupling with the second transmit coil.

8. A wireless power receiver configured to receive wireless power from a wireless power transmit coil, the wireless power receiver comprising:

a first receive coil having a first mutual coupling with the transmit coil;

a second receive coil having a second mutual coupling with the transmit coil;

a first load coupled to the first receive coil, the first load configured to receive at least a portion of the wireless power; and

a second load coupled to the second receive coil, the second load configured to receive at least a portion of the wireless power.

9. A method of receiving wireless power from a wireless power transmit coil, the method comprising:

determining a first characteristic of a first receive coil, the first receive coil having a first mutual coupling with the transmit coil;

determining a second characteristic of a second receive coil, the second receive coil having a second mutual coupling with the transmit coil, the second receive coil designed for substantially the same frequency of operation as the first receive coil; and

selecting one of the first and the second receive coil, based on the first characteristic and the second characteristic; and

coupling a load to the selected receive coil,

wherein an orientation of the first receive coil is variable with respect to an orientation of the second receive coil.

10. The method of claim 9, further comprising adjusting the orientation of the first receive coil with respect to an orientation of the second receive coil.

11. The method of claim 9, further comprising:

rectifying an output of the first receive coil;

rectifying an output of the second receive coil; and

regulating the output of the selected receive coil.

12. The method of claim 9, wherein the characteristic comprises a voltage at the first receive coil and the second receive coil.

13. The method of claim 9, wherein the characteristic comprises a mutual inductance between the first receive coil and the transmit coil, and between the second receive coil and the transmit coil.

14. The method of claim 9, further comprising selecting the receive coil with the greatest coupling to the transmit coil.

15. An apparatus for receiving wireless power from a wireless power transmitter, the apparatus comprising:

first means for receiving wireless power from the transmitter;

second means for receiving wireless power from the transmitter, the second means for receiving wireless power designed for substantially the same frequency of operation as the first means for receiving wireless power; and

a load coupled to at least one of the first means for receiving wireless power and the second means for receiving wireless power,

wherein an orientation of the first means for receiving wireless power is variable with respect to an orientation of the means for receiving wireless power.

16. The apparatus of claim 15, further comprising:

first means for rectifying coupled to the first means for receiving wireless power;

second means for rectifying coupled to the second means for receiving wireless power; and

regulating means for coupling the first means for rectifying and the second means for rectifying to the load.

17. The apparatus of claim 15, further comprising:

means for rectifying coupled to the first means for receiving wireless power and the second means for receiving wireless power; and

regulating means for coupling the means for rectifying to the load.

18. The apparatus of claim 17, wherein the regulating means is configured to receive, via the means for rectifying, power from one of the first means for receiving wireless power and the second means for receiving wireless power, based on a characteristic of the first means for receiving wireless power and the second means for receiving wireless power.

19. The apparatus of claim 18, wherein the characteristic comprises a voltage at the first means for receiving wireless power and the second means for receiving wireless power.

20. The apparatus of claim 18, wherein the characteristic comprises a mutual inductance between the first means for receiving wireless power and the transmitter, and between the second means for receiving wireless power and the transmitter.

21. The apparatus of claim 15, wherein the wireless power receiver is further configured to receive wireless power from a second wireless power transmitter, the first means for receiving wireless power having a third mutual coupling with the second transmitter, the second means for receiving wireless power having a fourth mutual coupling with the second transmitter.

22. A non-transitory computer-readable medium comprising code that, when executed, causes an apparatus to:

determine a first characteristic of a first receive coil, the first receive coil having a first mutual coupling with a transmit coil configured to transmit wireless charging power;

determine a second characteristic of a second receive coil, the second receive coil having a second mutual coupling with the transmit coil, the second receive coil designed for substantially the same frequency of operation as the first receive coil; and

select one of the first and the second receive coil, based on the first characteristic and the second characteristic; and

couple a load to the selected receive coil,

wherein an orientation of the first receive coil is variable with respect to an orientation of the second receive coil.

23. The medium of claim 22, further comprising code that, when executed, causes the apparatus to adjust the orientation of the first receive coil with respect to an orientation of the second receive coil.

24. The method of claim 22, further comprising code that, when executed, causes the apparatus to:

rectify an output of the first receive coil;

rectify an output of the second receive coil; and

regulate the output of the selected receive coil.

25. The method of claim 22, wherein the characteristic comprises a voltage at the first receive coil and the second receive coil.

26. The method of claim 22, wherein the characteristic comprises a mutual inductance between the first receive coil and the transmit coil, and between the second receive coil and the transmit coil.

27. The method of claim 22, further comprising code that, when executed, causes the apparatus to select the receive coil closest to the transmit coil.